I have a 40 year old house. I just bought a new GE washer and have a problem with the drain pipe overflowing. I noticed that the drain pipe goes almost all the way to the floor to a p-trap then goes back up to a right turn towards the standpipe. It then goes at a slight upward angle to connect to the standpipe. Is this correct or do I need to change the piping.

then goes back up to a right turn towards the standpipe. It then goes at a slight upward angle to connect to the standpipe. These bothere me. EVERYTHING should slope towards the sewer. There should be no "goes back up" or ":slight upward angle" anywhere in that line. That's my opinion on the installation. However I may be able to help the backups. Your new washer might have a more powerful pump that's overpowering the drain line. The solution would be to convert to a closed system, ( had to do that myself.) It's easy! Simply connect the washer hose to the standpipe using a compression fitting or a rubber coupling, (see image) or you can just duct tape it shut. I did that to my system and no more backups. Good luck, Tom